It isn't clear when exactly Kaeth lived, though given that the last of the kings discussed in his book was Daeron II Targaryen, who died about ninety years before the War of the Five Kings, he probably lived some time after Daeron II died. Nevertheless, he still lived quite a long time ago. Kaeth's Lives of Four Kings is considered a literary classic, and his hand-drawn illuminations to be a masterpiece; only four original copies of his book survived, until Joffrey senselessly destroyed one at his wedding feast.